Codechange: Use .fill() to clear an array instead of assigning a new array. (#13880)

Avoids allocating a temporary on the stack.

src/company_cmd.cpp

@@ -787,7 +787,7 @@ static IntervalTimer<TimerGameEconomy> _economy_companies_yearly({TimerGameEcono
 	for (Company *c : Company::Iterate()) {
 		/* Move expenses to previous years. */
 		std::rotate(std::rbegin(c->yearly_expenses), std::rbegin(c->yearly_expenses) + 1, std::rend(c->yearly_expenses));
-		c->yearly_expenses[0] = {};
+		c->yearly_expenses[0].fill(0);
 		InvalidateWindowData(WC_FINANCES, c->index);
 	}
 

src/economy.cpp

@@ -204,7 +204,7 @@ int UpdateCompanyRatingAndValue(Company *c, bool update)
 	Owner owner = c->index;
 	int score = 0;
 
-	_score_part[owner] = {};
+	_score_part[owner].fill(0);
 
 	/* Count vehicles */
 	{

src/industry_cmd.cpp

@@ -3072,7 +3072,7 @@ static IntervalTimer<TimerGameEconomy> _economy_industries_monthly({TimerGameEco
 
 void InitializeIndustries()
 {
-	Industry::industries = {};
+	Industry::industries.fill({});
 	_industry_sound_tile = TileIndex{};
 
 	_industry_builder.Reset();

src/vehicle.cpp

@@ -675,8 +675,8 @@ static void UpdateVehicleViewportHash(Vehicle *v, int x, int y, int old_x, int o
 void ResetVehicleHash()
 {
 	for (Vehicle *v : Vehicle::Iterate()) { v->hash_tile_current = nullptr; }
-	_vehicle_viewport_hash = {};
-	_vehicle_tile_hash = {};
+	_vehicle_viewport_hash.fill(nullptr);
+	_vehicle_tile_hash.fill(nullptr);
 }
 
 void ResetVehicleColourMap()